memcached-issues to keep Java entities in the memcached

Today, in the form of a code instance, summarize the issues that you should be aware of when you save Java entities to memcached:

Memcached Tool Class Code:

Package Com.ghj.packageoftool;import Java.util.date;import Com.danga.memcached.memcachedclient;import com.danga.memcached.sockiopool;/** * MemCached Tool class * * @author Gaohuanjie */public class Memcachedutils {private static Me Mcachedclient memcachedclient;static {/************************************ configuration memcached**************************         /Sockiopool Sockiopool = Sockiopool.getinstance (); Sockiopool.setservers (New string[]{"127.0.0.1:11211"});//Set memcached server address Sockiopool.setweights (new integer[]{3}) ;  Set each memcached server weight sockiopool.setfailover (true);         Whether to connect to another memcached server when a memcached server fails.    Sockiopool.setinitconn (10);     Number of connections established for each server at initialization sockiopool.setminconn (10);    Each server establishes the minimum number of connections sockiopool.setmaxconn (100);  Establish maximum number of connections per server Sockiopool.setmaintsleep (30);    Self-examination thread cycle to work, the time of each sleep Sockiopool.setnagle (false); The socket parameter, if true, is not buffered when writing the data and is immediately sent out. The rule of TCP is that before a packet is sent, the sender of the packet waits for the remote receiver to confirm that it has received the last packet sent.This method closes the socket cache-the packet is ready to be sent out immediately.  Sockiopool.setsocketto (3000); The socket block reads the data timeout Sockiopool.setalivecheck (true);//sets whether to check whether the memcached server is invalid Sockiopool.setmaxidle (1000*30* 30);  Set maximum processing time Sockiopool.setsocketconnectto (0);  Control of timeout when connection is established sockiopool.initialize ();         Initialize the connection pool if (memcachedclient = = null) {memcachedclient = new memcachedclient (); }}private memcachedutils () {}/** * Adds a key-value pair to the cache and sets a time-out for that key-value pair (that is, how long after that key-value pair is removed from the memcached memory cache, such as: New Date (1000*10), is removed from the memcached memory cache after 10 seconds). * * @author Gaohuanjie */public Static Boolean Add (String key, Object value, Date expire) {try {return memcachedclient.ad D (key, value, expire);} catch (Exception e) {e.printstacktrace (); return false;}} /** * The corresponding value in the memcached memory cache management system according to the key * * @author Gaohuanjie */public static Object get (String key) {try {return memcachedcli Ent.get (key);} catch (Exception e) {e.printstacktrace (); return null;}}}

Test the class code of the Main method:

Package Com.ghj.packageofclient;import Java.util.date;import Com.ghj.packageoftool.memcachedutils;import Com.ghj.packageofvo.user;public class Client{public static void Main (string[] args) {Memcachedutils.add ("User", new User ("Liunannan", "[email protected]"), new Date (1000*60));//Add a serialized object to memcached User user = (user) ( Memcachedutils.get ("user")); System.err.println ("Username:" +user.getusername () + ", Password:" + User.getpassword ());}}

Java Entity code:

Package com.ghj.packageofvo;/** * User Business Bean *  * @author Gao Yingjie */public class User{private string Username;private string Password;public User (String userName, string password) {super (); this.username = Username;this.password = password;} Public String GetUserName () {return userName;} public void Setusername (String userName) {this.username = UserName;} Public String GetPassword () {return password;} public void SetPassword (String password) {this.password = password;}}

Run the main method and you will see the following exception:

A bit of Java-based people know: The reason why this problem occurs is because the Java entity User class is not instantiated, so the user class should be changed to the following code:

Package Com.ghj.packageofvo;import java.io.serializable;/** * User Business Bean *  * @author Gao Yingjie */public class user implements Serializable{private static final Long serialversionuid = -3371451210123762490l;private string Username;private string p Assword;public User (String userName, string password) {super (); this.username = Username;this.password = password;} Public String GetUserName () {return userName;} public void Setusername (String userName) {this.username = UserName;} Public String GetPassword () {return password;} public void SetPassword (String password) {this.password = password;}}

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memcached-issues to keep Java entities in the memcached